Yesterday was the kickoff to the 2012 Sunday Streets season in San Francisco, an event that creates a large, temporary, public space by closing off stretches of a neighborhood’s streets to automobile traffic, and opening them to pedestrians, bicyclists, and activities. The opener to what promises to be another glorious season of people-powered streets took place along the Embarcadero, from Mariposa @ 3rd Street at the southern end all the way to Fisherman’s Wharf. We’re dig deeper